[issue2650] re.escape should not escape underscore

[James Y Knight]

James Y Knight <foom at users.sourceforge.net> added the comment:

Right you are, it seems that python's regexp implementation is terribly slow when doing replacements with a substitution in them. (fixing the broken test, as you pointed out changed the timing to 97.6 usec vs the in-error-reported 18.3usec.)

Oh well. I still think it's crazy not to use re for this in its own module. Someone just needs to fix re to not be horrifically slow, too. :)

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